I've just discovered a conflict between HelixPlayer and mplayerplug-in 2.45 for mime type "application/smil"
<a href="http://fedoranews.org/tchung/hxplay-ms2/mime-smil.png">

If you have both HelixPlayer and mplayerplug-in 2.45 installed on your Fedora Core 1 system and visit  <a href="http://www.npr.org/"http://www.npr.org</a> to listen to NPR Hourly News, you will notice it conflicts each other until you remove mplayerplug-in 2.45

This is new issue since mplayerplug-in 2.40 and previous version did not conflict with HelixPlayer before.

Thomas Chung